PHYSICAL topic 1 -atomic structure

Question 1

Describe how the molecules are ionised using electrospray ionisation. (3)

Answer 1

1 Sample is) dissolved (in a volatile solvent)
1 (Injected through) needle/nozzle/capillary at high voltage
1 Each particle gains a H+

Question 2

Define the term relative atomic mass {2}

Answer 2

.avg mass of an atom of an element
.Compared to 1/12th the mass of an atom of carbon-12

Question 3

Give 2 reasons why its necessary to ionise isotopes of chromium before being analysed in TOF mass spectrometer (2)

Answer 3

.so Ions be accelerated by electric field
. Ions create current when hitting detector

Question 4

how do you show something is a limiting reagent

Answer 4

if it is less moles than it should be

Question 5

define relative molecular mass {1}

Answer 5

average mass of a molecule compared to 1/12 mass of atom of carbon 12